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Quick answer: Country-level average IQ estimates from published datasets range roughly 60–108. The top group (Singapore, Hong Kong, South Korea, Japan, China, Taiwan) scores 105–108. Researchers have criticized the data’s coverage and methodology, so treat this as a rough map rather than a definitive ranking.
Where Do Average IQ by Country Numbers Come From?
The most-cited country IQ dataset is the work of Richard Lynn and Tatu Vanhanen (2002, 2006, 2012), later updated by David Becker in the Vienna dataset. They compiled national IQ estimates by averaging results from published cognitive tests administered in each country and — where no test data existed — imputing values from neighbouring nations. That imputation is the main source of controversy.
Top 20 Countries by Estimated Average IQ
| Rank | Country | Est. average IQ |
|---|---|---|
| 1 | Singapore | 108 |
| 2 | Hong Kong | 108 |
| 3 | South Korea | 106 |
| 4 | Japan | 106 |
| 5 | China | 104 |
| 6 | Taiwan | 104 |
| 7 | Italy | 102 |
| 8 | Switzerland | 102 |
| 9 | Netherlands | 101 |
| 10 | Finland | 101 |
| 11 | Germany | 100 |
| 12 | Austria | 100 |
| 13 | Canada | 100 |
| 14 | United Kingdom | 100 |
| 15 | Belgium | 99 |
| 16 | New Zealand | 99 |
| 17 | Australia | 99 |
| 18 | Sweden | 99 |
| 19 | France | 98 |
| 20 | United States | 97 |
Figures rounded from Vienna dataset / Lynn 2012.
Are Average IQ by Country Rankings Accurate?
- Missing data. Many countries in Lynn’s list have no real test results — the value is imputed from neighbours. That includes most of sub-Saharan Africa.
- Sample bias. National averages sometimes come from a single small school or university sample, not a representative population.
- The Flynn effect. Population IQ has risen roughly 3 points per decade over the 20th century. Old test data understates modern scores.
- Nutrition, health, schooling. Country differences correlate strongly with GDP, iodine intake, disease burden, and years of schooling — not fixed traits.
- Politicised misuse. The dataset has been misused to support racist claims. Most cognitive-science researchers treat cross-country comparisons as unreliable for anything beyond very rough policy analysis.
Does Your Country’s Average IQ Affect Your Score?
Your country’s average tells you almost nothing about your own IQ. Individual variation within any country far exceeds average differences between countries. Take a free IQ test and see the percentile calculator to place yourself on the global bell curve.
Is There a “Smartest Country”?
The datasets consistently rank East Asian nations at the top and the poorest Global South countries at the bottom. But that reflects opportunity, nutrition, and testing conditions — not innate capacity. Cross-cultural cognition researchers argue tests standardized in Western contexts systematically disadvantage populations they weren’t designed for.
Have average IQ scores changed over time?
Yes. Through most of the 20th century, average test scores rose roughly three points per decade in many countries — a pattern known as the Flynn effect, linked to better nutrition, schooling, and familiarity with testing. Several developed nations have since shown a plateau or slight decline, so national averages are best read as broad estimates rather than fixed traits.
Frequently asked questions
Which country has the highest average IQ?
In most published datasets, East Asian countries such as Japan, South Korea, Taiwan, Singapore and China report the highest average scores (roughly 104–106). These numbers come from different studies of varying quality, so small gaps between countries are better treated as noise than as fact.
Are “average IQ by country” rankings reliable?
Only loosely. National estimates are shaped by education, health, nutrition, sample size and how the tests were run — not just innate ability. They show broad patterns, but should never be used to judge an individual. See what actually counts as a good IQ score.
What is the average IQ in the United States?
US figures are usually reported at around 97–98, close to the global reference point of 100. Like every country figure here, it is an estimate that shifts between studies.
Why do average IQ scores differ between countries?
The main drivers are access to education, healthcare and nutrition, plus test familiarity and living conditions — factors that can change within a single generation. That is why average scores have risen over time in many countries, a pattern known as the Flynn effect.